well in tuscany the cusine is definitely mediterranean, because here olive trees grow.
in emilia their regional cusine has ragout, you are right.
and north of rome and in all italy fresh toamtoes are common, except along the alpine chain; but the use of tomato's sauces, begins from tuscany to south; in tuscany we have "pappa al pomodoro", that uses tomato sauce.
but you won't find tomato as a liquid sauce north of florence.
Tuscany isn't considered northern italy; it's considered central italy, and when people want to be more precise it's considered centre-north italy.
Emilia-Romagna you are right it's plain north italy.